Many people cook food in tap water and justify it by saying that due to boiling and heating of food, all the water-based bacteria kill. However, if asked, we would suggest not to use tap water for cooking. According to science water is safe to drink after it gets boiled up, as all the germs and bacteria wash off completely. But the matter is beyond the presence of germs and bacteria. Water contains insecticides, pesticides, germicides etc. which is actually unsafe to consume. When we use tap water for cooking, it may eradicate the bacteria but the chemicals still stay in it.One can use tap water by using a tap filter on it just to wash the raw vegetables. However, you must cook your food in properly filtered water. There are certain residential areas where the water is either too much salty or way too muddy. Even after filtering it, the water is slightly unusual in taste. Thus, especially in those areas, people should not use tap water at all. Besides this, using tap water might increase the possibility of water-borne diseases.So, in order to stay healthy and fit, one must use filtered water for drinking and cooking purpose. Some people wash vegetables in tap water after cutting them. It is extremely an unhealthy practice. All the pesticides and insecticides in vegetables multiply with the unfiltered water and make you fall sick.The result of using tap water for cooking purpose or washing vegetable might not be immediate. But surely it is not as healthy as we believe. It is recommended to cook food in filtered water to avoid any chances of catching the risk of water-borne diseases.References: https://www.lifealth.com/wellness/healthy-living/cooking-food-tap-water-safe-not-mj/56374/